My friend linked me this
http://simulationcraft.org/430/Raid_T13H.html
I've never used Simcraft, so i don't know how correct it is with the data. Some people say they don't believe it, and others give a mixed feel on it. As i've never used it before, i can't really believe it too well.
But my friend had convinced me that there is a huge loss in shadow priests dps this content, and he convinced me to go back to my mage i dropped during FL to go shadow priest. I'm really hoping this isn't the end result for the shadow priest, because i really liked playing mine. But for progress raids, we are going to need classes that can hit high dps with ease.